Originally Posted by widbimmer
I had my JB4 installed a couple of weeks ago and Im on map 0 because map 1 makes my car get into Limp Mode... as soon as I pass 4k revs it just chokes!!! Do I need to update the software that comes from a brand new JB4??? Ive been told that this sofftware works better with a 135i N54 and that it will give me trouble with my 1M....... I have a friend that has the exact same problem and he has already installed downpipes!!!
either you installed it wrong or you might be having cylinder misfires.